9=9(a-9)

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Solution for 9=9(a-9) equation: 



9=9(a-9)

We move all terms to the left:

9-(9(a-9))=0



We calculate terms in parentheses: -(9(a-9)), so:

9(a-9)

We multiply parentheses

9a-81

Back to the equation:

-(9a-81)



We get rid of parentheses

-9a+81+9=0

We add all the numbers together, and all the variables

-9a+90=0

We move all terms containing a to the left, all other terms to the right

-9a=-90

a=-90/-9

a=+10

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